controller.java

Simple login example for jsp beginner...

package us.souther.simple.login;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.Map;
import java.util.HashMap;

public class Controller extends HttpServlet{
    
    private final Map actions = new HashMap();
    public void init(){
        actions.put("login.do",  new LoginAction());
        actions.put("logout.do", new LogoutAction());
    }

    public void doPost(HttpServletRequest  request,
                       HttpServletResponse response)
                   throws ServletException, IOException{

        
        String uri = request.getRequestURI();
        uri = uri.substring(uri.lastIndexOf("/") + 1, uri.length());
                                                                                
        Action action = (Action)actions.get(uri);
        if(null == action){
            throw new IllegalArgumentException("no action for " + uri);
        }

        action.perform(request, response);
    }
    public void doGet(HttpServletRequest  request,
                       HttpServletResponse response)
                   throws ServletException, IOException{
        doPost(request, response);
    }
}